EP1455122B1 - Seal ring - Google Patents

Seal ring Download PDF

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Publication number
EP1455122B1
EP1455122B1 EP04004953A EP04004953A EP1455122B1 EP 1455122 B1 EP1455122 B1 EP 1455122B1 EP 04004953 A EP04004953 A EP 04004953A EP 04004953 A EP04004953 A EP 04004953A EP 1455122 B1 EP1455122 B1 EP 1455122B1
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EP
European Patent Office
Prior art keywords
sealing
sealed
region
sealing ring
ring according
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Expired - Lifetime
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EP04004953A
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German (de)
French (fr)
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EP1455122A1 (en
Inventor
Celine Guillerme
Eric Kammerer
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication of EP1455122A1 publication Critical patent/EP1455122A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3228—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip formed by deforming a flat ring

Definitions

  • the invention relates to a sealing ring, comprising a sealing sleeve made of polymeric material, which is considered during normal use, viewed in longitudinal section, substantially L-shaped, with a substantially extending in the radial direction mounting portion and extending substantially in the axial direction Sealing region which sealingly encloses the surface of a machine element to be sealed with radial prestressing, the sealing region having on the surface facing side at least one return conveyor for conveying medium to be sealed in the direction of the space to be sealed, wherein the return conveyor is formed by a profiling, with a delivery volume , which is reduced from the space to be sealed in the direction of the environment, wherein the return conveyor is formed by at least one helical remind aspectnut and wherein the remindenianut a to be sealed from the Room along the sealing area towards the environment has decreasing groove depth.
  • Such a sealing ring is from the US Pat. No. 6,428,013 B1 known.
  • Fig. 7 an embodiment is shown in which the sealing sleeve is bulged in the direction of the environment / air side, wherein the sealing sleeve on the side facing the surface to be sealed has a return conveyor in the form of a spiral remindnut, with a space to be sealed from the sealing area toward the environment reducing groove depth.
  • the known sealing ring comprises a sealing sleeve made of polymeric material, which is considered during normal use, viewed in longitudinal section, is substantially L-shaped, with a substantially extending in the radial direction mounting portion and a substantially extending in the axial direction sealing area, the the surface of a machine element to be sealed, which is designed as a shaft, sealingly encloses with radial bias.
  • the sealing area is bulged in the direction of the space to be sealed and has on the side facing the surface of a return conveyor for conveying medium to be sealed in the direction of the sealed space.
  • the return conveyor device of the previously known sealing ring extends from its free end facing away from the fastening area of the sealing collar to a micro-rib which is supported on the surface of the machine element to be sealed.
  • the return conveyor is formed as a groove, wherein the groove from the free end of the sealing collar to the micro-lip, that is in its sealing area, in its geometry is unchanged; the return volume in this area is constant.
  • a further groove portion is arranged, wherein the Groove of this groove portion is open towards the environment and with respect to the return promotion of medium to be sealed in the direction of the space to be sealed without function. This groove portion is deviating from the groove portion extending from the free end of the sealing collar to the micro-lip.
  • the object of the invention is to further develop a sealing ring of the type mentioned at the outset such that the delivery rate along the sealing area is matched to the quantity of medium to be sealed back into the space to be sealed.
  • a sealing ring is provided in which the ratio of the largest groove depth to the smallest groove depth in the sealing region is 2 to 6. It is advantageous that the delivery of the return conveyor is tuned to the back in the space to be sealed to be conveyed amount of medium to be sealed, which is located on the surface of the machine element to be sealed in the sealing region of the sealing sleeve.
  • the delivery rate of the return conveyor device is greater on the side of the sealing area facing the space to be sealed than on the side facing the surroundings.
  • the return conveyor is formed by at least one spiral return feed groove.
  • Such recirculating devices are well known in the art. They are simple and inexpensive to produce and have good performance characteristics for a long service life.
  • the return feed groove has a groove depth which decreases from the space to be sealed along the sealing area in the direction of the environment. If the sealing collar has only one parameter which changes along the sealing area, that is to say, for example, the groove depth, the sealing collar and thus the entire sealing ring can be produced simply and inexpensively.
  • the groove depth changing along the sealing area is sufficient to reach a delivery volume which is reduced from the space to be sealed in the direction of the environment.
  • the specific delivery rate / the specific delivery volume, based on the respective amount of medium to be sealed back to be conveyed is the same along the entire sealing area.
  • the delivery volume is preferably continuously reduced along the sealing region, from the space to be sealed in the direction of the environment. This ensures that the delivery volume, viewed along the sealing area, is proportional to the amount of each to be conveyed back into the sealed space to be sealed medium.
  • the return conveyor On the side facing the space to be sealed, the return conveyor is dimensioned such that the Delivery volume is comparatively large, in order to promote the pending in this area at the sealing area comparatively large volume of medium to be sealed back into the sealed space.
  • the delivery volume / flow only needs to be comparatively low to the small amount of medium to be sealed back into the space to be sealed to promote.
  • the pitch and / or width of the return feed groove may be substantially constant along the sealing area.
  • the production of the sealing sleeve is simplified.
  • the pitch and / or width of the return feed groove may be varied along the sealing area.
  • the pitch and / or the width of the return feed groove preferably decreases from the fastening area to the free end of the sealing collar. This supports the effect of the decreasing groove depth. At the same time, dust / dirt in the environment is prevented from entering.
  • the sealing area can, starting from the mounting flange, be arched axially in the direction of the environment.
  • the sealing ring with the sealing collar according to the invention is of particular advantage.
  • Sealing sleeves which bulge in the direction of the environment, have the advantage that the radial contact pressure of the sealing collar on the shaft at the free end of the sealing sleeve can be controlled. This results in an increased sealing effect and a longer service life.
  • a Vorschaltdichtung can be attached at the free end of the sealing sleeve. This is an effective barrier against dust / dirt.
  • Such Vorschaltdichtung is simple and inexpensive to produce and has small dimensions.
  • the sealing sleeve When mounting in the annular gap between the shaft and the receiving bore, the sealing sleeve, due to the assembly, is deformed into its intended shape. A mounting cone for mounting the sealing sleeve is not required. Assembly errors are reduced to a minimum in such an embodiment.
  • the radial prestress with which the sealing area sealingly surrounds the surface of the machine element to be sealed is, viewed in longitudinal section, so different that the sealing area has a higher contact pressure on its side facing the fastening area in the area of his free end. This is especially true if the shape of the return conveyor along the entire sealing area would be consistent.
  • the sealing collar can for example consist of a PTFE compound.
  • PTFE is a material which is resistant to most media to be sealed and has negligible abrasive wear throughout the life of the seal.
  • FIGS. 1 and 3 in each case a sealing ring is shown during its intended use.
  • the machine element 5 to be sealed is in each case formed by a shaft in the exemplary embodiments shown here.
  • sealing rings shown each comprise a sealing sleeve 1 of polymeric material, in the embodiments shown here of a PTFE compound.
  • the sealing collars 1 are each L-shaped and comprise a fastening area 2 extending essentially in the radial direction and a sealing area 3 extending essentially in the axial direction.
  • the fastening area 2 and the sealing area 3 are in the exemplary embodiments shown here integrally merging into each other and formed of the same material.
  • the sealing region 3 of the sealing collar 1 surrounds the surface 4 of the machine element 5 to be sealed with a radial prestress in a sealing manner.
  • spiral return feed groove 12 is arranged to promote sealed medium 7 in the direction of the space to be sealed.
  • the sealing collar 1 is bulged axially in the direction of the environment 11.
  • the decisive factor is that the profile 9 designed as a return conveyor 6 has a delivery volume 10 / a delivery rate which is reduced from the space 8 to be sealed in the direction of the environment 11.
  • the specific delivery rate along the entire sealing area is the same; the delivery rate of the return conveyor 6 is matched to the medium to be sealed back into the space 8 to be sealed medium 7.
  • both the pitch 14 and the width 15 of the return feed groove 12 along the sealing area 3 are substantially constant.
  • the only variable for achieving a constant specific delivery rate is the groove depth 13.
  • the groove depth 13 is along the groove depth 13
  • Sealing region 3 is varied such that the return feed groove 12 has a from the sealed space 8 along the sealing region 3 in the direction of the environment 11 decreasing groove depth 13.
  • the ratio of the largest groove depth 13.1 on the side to the sealed space 8 side to the smallest groove depth 13.n in the sealing area is in the embodiments shown here 4th
  • FIG. 1 a first embodiment of the sealing ring according to the invention is shown.
  • the sealing collar 1 has only on the surface 4 to be sealed of the machine element 5 a profiling 9 in the form of a return feed groove 12. On the side facing away from the surface 4 of the sealing sleeve 1, this is flat.
  • the return feed groove 12 is, viewed in longitudinal section, formed substantially trapezoidal.
  • FIG. 2 the sealing region 3 of the sealing sleeve 1 is shown enlarged.
  • FIG. 3 a second embodiment of the sealing ring according to the invention is shown, which extends from the sealing ring FIG. 1 differs by a differently shaped sealing collar 1.
  • Deviating from the sealing sleeve 1 off FIG. 1 is the sealing sleeve 1 off FIG. 3 additionally provided on the surface 4 radially facing away from the sealing portion 3 with a second profiling 16.
  • the second profiling 16 is usually carried out less deep and with a smaller pitch than the first profiling 9.
  • the free end 17 of the sealing sleeve 1 has a arranged in the direction of the environment 11 Vorschaltdichtung 18, the impurities from the environment 11 from the sealing area 3 keeps away.
  • the Vorschaltdichtung 18 is integrally merging with each other and made of the same material with the sealing sleeve.
  • FIG. 5 a third embodiment is shown, in which the width and / or the slope 19/20 of the return feed groove 12 along the sealing region 3 is varied.
  • FIG. 6 a housing closure cover 21 is shown, in which the sealing ring according to the invention is integrated.
  • the statically acting seal on the housing closure cover 21 is provided with the reference numeral 22, the transmitter / multipole wheel with the reference numeral 23 and the transducer / sensor with the reference numeral 24.
  • the return conveyor 6 can be helical, helical or concentric, catchy or more continuous, and the return grooves can, for example, be trapezoidal, triangular, sawtooth or caterpillar in longitudinal section.
  • the return feed groove 12 can be shut off, for example by a bulkhead and / or by a circumferential projection. Notwithstanding a PTFE compound from which the sleeve 1 is made, other suitable materials for the sealing sleeve 1 can be used.

Abstract

Sealing ring comprises a sealing collar made from an L-shaped polymeric material with a fixing region (2) extending in the radial direction and a sealing region extending in the axial direction. The sealing region has a recirculating device on the side facing the surface of a machine element to convey a medium to be sealed in the direction of the chamber to be sealed. Sealing ring comprises a sealing collar (1) made from an L-shaped polymeric material with a fixing region (2) extending in the radial direction and a sealing region (3) extending in the axial direction. The sealing region has a recirculating device (6) on the side facing the surface (4) of a machine element (5) to convey a medium to be sealed in the direction of the chamber (8) to be sealed. The recirculating device is formed by a profile (9) having a conveying volume (10) which is reduced by the chamber to be sealed. An independent claim is also included for a housing closure lid containing the sealing ring.

Description

Technisches GebietTechnical area

Die Erfindung betrifft einen Dichtring, umfassend eine Dichtmanschette aus polymerem Werkstoff, die während der bestimmungsgemäßen Verwendung, im Längsschnitt betrachtet, im wesentlichen L-förmig ausgebildet ist, mit einem sich im wesentlichen in radialer Richtung erstreckenden Befestigungsbereich und einem sich im wesentlichen in axialer Richtung erstreckenden Dichtbereich, der die Oberfläche eines abzudichtenden Maschinenelements mit radialer Vorspannung dichtend umschließt, wobei der Dichtbereich auf der der Oberfläche zugewandten Seite zumindest eine Rückfördereinrichtung zur Förderung von abzudichtendem Medium in Richtung des abzudichtenden Raums aufweist, wobei die Rückfördereinrichtung durch eine Profilierung gebildet ist, mit einem Fördervolumen, das vom abzudichtenden Raum in Richtung Umgebung reduziert ist, wobei die Rückfördereinrichtung durch zumindest eine spiralförmige Rückfördernut gebildet ist und wobei die Rückfördernut eine sich vom abzudichtenden Raum entlang des Dichtbereichs in Richtung Umgebung verringernde Nuttiefe aufweist.The invention relates to a sealing ring, comprising a sealing sleeve made of polymeric material, which is considered during normal use, viewed in longitudinal section, substantially L-shaped, with a substantially extending in the radial direction mounting portion and extending substantially in the axial direction Sealing region which sealingly encloses the surface of a machine element to be sealed with radial prestressing, the sealing region having on the surface facing side at least one return conveyor for conveying medium to be sealed in the direction of the space to be sealed, wherein the return conveyor is formed by a profiling, with a delivery volume , which is reduced from the space to be sealed in the direction of the environment, wherein the return conveyor is formed by at least one helical Rückfördernut and wherein the Rückfördernut a to be sealed from the Room along the sealing area towards the environment has decreasing groove depth.

Stand der TechnikState of the art

Ein solcher Dichtring ist aus der US 6,428,013 B1 bekannt. In Fig. 7 ist ein Ausführungsbeispiel gezeigt, bei dem die Dichtmanschette in Richtung der Umgebung/Luftseite vorgewölbt ist, wobei die Dichtmanschette auf der der abzudichtenden Fläche zugewandten Seite eine Rückfördereinrichtung in Form einer spiralförmigen Rückfördernut aufweist, mit einer sich vom abzudichtenden Raum entlang des Dichtbereichs in Richtung Umgebung verringernden Nuttiefe.Such a sealing ring is from the US Pat. No. 6,428,013 B1 known. In Fig. 7, an embodiment is shown in which the sealing sleeve is bulged in the direction of the environment / air side, wherein the sealing sleeve on the side facing the surface to be sealed has a return conveyor in the form of a spiral Rückfördernut, with a space to be sealed from the sealing area toward the environment reducing groove depth.

Ein weiterer Dichtring ist aus der DE 199 22 842 A1 bekannt. Der vorbekannte Dichtring umfasst eine Dichtmanschette aus polymerem Werkstoff, die während der bestimmungsgemäßen Verwendung, im Längsschnitt betrachtet, im wesentlichen L-förmig ausgebildet ist, mit einem sich im wesentlichen in radialer Richtung erstreckenden Befestigungsbereich und einem sich im wesentlichen in axialer Richtung erstreckenden Dichtbereich, der die Oberfläche eines abzudichtenden Maschinenelements, das als Welle ausgebildet ist, mit radialer Vorspannung dichtend umschließt. Der Dichtbereich ist in Richtung des abzudichtenden Raums vorgewölbt und weist auf der der Oberfläche zugewandten Seite eine Rückfördereinrichtung zur Förderung von abzudichtendem Medium in Richtung des abzudichtenden Raums auf.
Die Rückfördereinrichtung des vorbekannten Dichtrings erstreckt sich von seinem freien, dem Befestigungsbereich abgewandten Ende der Dichtmanschette bis zu einer Mikrolippe, die auf der Oberfläche des abzudichtenden Maschinenelements abgestützt ist. Die Rückfördereinrichtung ist als Nut ausgebildet, wobei die Nut vom freien Ende der Dichtmanschette bis zur Mikrolippe, also in ihrem Dichtbereich, in ihrer Geometrie unverändert ist; das Rückfördervolumen in diesem Bereich ist konstant.
Im bogenförmigen Übergangsbereich der Dichtmanschette, vom Dichtbereich zum Befestigungsbereich, ist ein weiterer Nutabschnitt angeordnet, wobei die Nut dieses Nutabschnitts in Richtung Umgebung offen ist und bezüglich der Rückförderung von abzudichtendem Medium in Richtung des abzudichtenden Raums ohne Funktion ist. Dieser Nutabschnitt ist abweichend von dem Nutabschnitt gestaltet, der sich vom freien Ende der Dichtmanschette bis zur Mikrolippe erstreckt.Another sealing ring is from the DE 199 22 842 A1 known. The known sealing ring comprises a sealing sleeve made of polymeric material, which is considered during normal use, viewed in longitudinal section, is substantially L-shaped, with a substantially extending in the radial direction mounting portion and a substantially extending in the axial direction sealing area, the the surface of a machine element to be sealed, which is designed as a shaft, sealingly encloses with radial bias. The sealing area is bulged in the direction of the space to be sealed and has on the side facing the surface of a return conveyor for conveying medium to be sealed in the direction of the sealed space.
The return conveyor device of the previously known sealing ring extends from its free end facing away from the fastening area of the sealing collar to a micro-rib which is supported on the surface of the machine element to be sealed. The return conveyor is formed as a groove, wherein the groove from the free end of the sealing collar to the micro-lip, that is in its sealing area, in its geometry is unchanged; the return volume in this area is constant.
In the arcuate transition region of the sealing collar, from the sealing area to the fastening area, a further groove portion is arranged, wherein the Groove of this groove portion is open towards the environment and with respect to the return promotion of medium to be sealed in the direction of the space to be sealed without function. This groove portion is deviating from the groove portion extending from the free end of the sealing collar to the micro-lip.

Der Erfindung liegt die Aufgabe zu Grunde, einen Dichtring der Eingangs genannten Art derart weiterzuentwickeln, dass die Förderleistung entlang des Dichtbereichs auf die in den abzudichtenden Raum zurück zu fördernde Menge von abzudichtendem Medium abgestimmt ist.The object of the invention is to further develop a sealing ring of the type mentioned at the outset such that the delivery rate along the sealing area is matched to the quantity of medium to be sealed back into the space to be sealed.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved with the features of claim 1. In advantageous embodiments, the dependent claims relate.

Zur Lösung der Aufgabe ist ein Dichtring vorgesehen, bei dem das Verhältnis aus größter Nuttiefe zu kleinster Nuttiefe im Dichtbereich 2 bis 6 beträgt.
Hierbei ist von Vorteil, dass die Förderleistung der Rückfördereinrichtung auf die in den abzudichtenden Raum zurück zu fördernde Menge von abzudichtendem Medium abgestimmt ist, das sich auf der Oberfläche des abzudichtenden Maschinenelements im Dichtbereich der Dichtmanschette befindet. Die Förderleistung der Rückfördereinrichtung ist auf der dem abzudichtenden Raum zugewandten Seite des Dichtbereichs größer als auf der der Umgebung zugewandten Seite. Durch die an die in den abzudichtenden Raum zurück zu fördernde Menge von abzudichtendem Medium angepasste Geometrie der Rückfördereinrichtung kann der Dichtbereich, bezogen auf die erforderliche Wirksamkeit in seinen jeweiligen Teilbereichen, besonders effizient gestaltet werden. Beim erfindungsgemäßen Dichtring ist es nicht erforderlich, auf der dem abzudichtenden Raum abgewandten Seite des Dichtbereichs eine Rückfördereinrichtung mit überdimensioniertem Fördervolumen vorzusehen und daraus resultierenden überdimensionierten Abmessungen der Dichtmanschette.To solve the problem, a sealing ring is provided in which the ratio of the largest groove depth to the smallest groove depth in the sealing region is 2 to 6.
It is advantageous that the delivery of the return conveyor is tuned to the back in the space to be sealed to be conveyed amount of medium to be sealed, which is located on the surface of the machine element to be sealed in the sealing region of the sealing sleeve. The delivery rate of the return conveyor device is greater on the side of the sealing area facing the space to be sealed than on the side facing the surroundings. By adapted to be injected back into the space to be conveyed quantity of medium to be sealed adjusted geometry of the return conveyor, the sealing area, based on the required effectiveness in its respective areas, are designed to be particularly efficient. When sealing ring according to the invention, it is not necessary on the side facing away from the space to be sealed of the sealing area a return conveyor with oversized Provide delivery and resulting oversized dimensions of the sealing sleeve.

Die Rückfördereinrichtung ist durch zumindest eine spiralförmige Rückfördernut gebildet. Derartige Rückfördereinrichtungen sind aus dem Stand der Technik allgemein bekannt. Sie sind einfach und kostengünstig herstellbar und weisen gute Gebrauchseigenschaften während einer langen Gebrauchsdauer auf.The return conveyor is formed by at least one spiral return feed groove. Such recirculating devices are well known in the art. They are simple and inexpensive to produce and have good performance characteristics for a long service life.

Die Rückfördernut weist eine sich vom abzudichtenden Raum entlang des Dichtbereichs in Richtung der Umgebung verringernde Nuttiefe auf. Weist die Dichtmanschette nur einen Parameter auf, der sich entlang des Dichtbereichs ändert, also beispielsweise die Nuttiefe, ist die Dichtmanschette und damit der gesamte Dichtring einfach und kostengünstig herstellbar. Die entlang des Dichtbereichs sich ändernde Nuttiefe reicht aus, um ein Fördervolumen zu erreichen, das vom abzudichtenden Raum in Richtung der Umgebung reduziert ist.The return feed groove has a groove depth which decreases from the space to be sealed along the sealing area in the direction of the environment. If the sealing collar has only one parameter which changes along the sealing area, that is to say, for example, the groove depth, the sealing collar and thus the entire sealing ring can be produced simply and inexpensively. The groove depth changing along the sealing area is sufficient to reach a delivery volume which is reduced from the space to be sealed in the direction of the environment.

Für die meisten Anwendungsfälle hat es sich als vorteilhaft bewährt, wenn das Verhältnis aus größter Nuttiefe und kleinster Nuttiefe im Dichtbereich 2 bis 6, bevorzugt 4 beträgt. Bei derartigen Größenverhältnissen ist die spezifische Förderleistung/das spezifische Fördervolumen, bezogen auf die jeweils zurück zu fördernde Menge von abzudichtendem Medium entlang des gesamten Dichtbereichs gleich groß.For most applications, it has proven to be advantageous if the ratio of the largest groove depth and smallest groove depth in the sealing region 2 to 6, preferably 4. With such size ratios, the specific delivery rate / the specific delivery volume, based on the respective amount of medium to be sealed back to be conveyed, is the same along the entire sealing area.

Das Fördervolumen ist entlang des Dichtbereichs, vom abzudichtenden Raum in Richtung Umgebung, bevorzugt kontinuierlich reduziert. Dadurch wird erreicht, dass das Fördervolumen, entlang des Dichtbereichs betrachtet, proportional zur Menge des jeweils zurück in den abzudichtenden Raum zu fördernden abzudichtenden Mediums ist. Auf der dem abzudichtenden Raum zugewandten Seite ist die Rückfördereinrichtung derart dimensioniert, dass das Fördervolumen vergleichsweise groß ist, um das in diesem Bereich am Dichtbereich anstehende vergleichsweise große Volumen von abzudichtendem Medium wieder zurück in den abzudichtenden Raum zu fördern. Entlang des Dichtbereichs in Richtung Umgebung reduziert sich die Menge an abzudichtendem Medium, so dass auf der der Umgebung zugewandten Seite des Dichtbereichs das Fördervolumen/die Förderleistung nur noch vergleichsweise gering zu sein braucht, um die geringe Menge von abzudichtendem Medium wieder zurück in den abzudichtenden Raum zu fördern.The delivery volume is preferably continuously reduced along the sealing region, from the space to be sealed in the direction of the environment. This ensures that the delivery volume, viewed along the sealing area, is proportional to the amount of each to be conveyed back into the sealed space to be sealed medium. On the side facing the space to be sealed, the return conveyor is dimensioned such that the Delivery volume is comparatively large, in order to promote the pending in this area at the sealing area comparatively large volume of medium to be sealed back into the sealed space. Along the sealing area in the direction of the environment reduces the amount of medium to be sealed, so that on the side facing the environment of the sealing area, the delivery volume / flow only needs to be comparatively low to the small amount of medium to be sealed back into the space to be sealed to promote.

Die Steigung und/oder die Breite der Rückfördernut kann entlang des Dichtbereichs im wesentlichen konstant sein. Die Herstellung der Dichtmanschette ist dadurch vereinfacht.The pitch and / or width of the return feed groove may be substantially constant along the sealing area. The production of the sealing sleeve is simplified.

Die Steigung und/oder die Breite der Rückfördernut kann entlang des Dichtbereichs variiert sein. Vorzugsweise nimmt dabei die Steigung und/oder die Breite der Rückfördernut vom Befestigungsbereich zum freien Ende der Dichtmanschette ab. Dadurch wird die Wirkung der sich verringernden Nuttiefe unterstützt. Gleichzeitig wird in der Umgebung befindlicher Staub/Schmutz am Eindringen gehindert.The pitch and / or width of the return feed groove may be varied along the sealing area. In this case, the pitch and / or the width of the return feed groove preferably decreases from the fastening area to the free end of the sealing collar. This supports the effect of the decreasing groove depth. At the same time, dust / dirt in the environment is prevented from entering.

Der Dichtbereich kann, ausgehend vom Befestigungsflansch, axial in Richtung Umgebung vorgewölbt sein. Speziell für eine solche Bauform ist der Dichtring mit der erfindungsgemäßen Dichtmanschette von besonderem Vorteil.
Dichtmanschetten, die in Richtung der Umgebung vorgewölbt sind, haben den Vorteil, dass die radiale Anpressung der Dichtmanschette auf die Welle am freien Ende der Dichtmanschette gesteuert werden kann. Daraus resultiert eine gesteigerte Dichtwirkung und eine verlängerte Gebrauchsdauer. Am freien Ende der Dichtmanschette kann eine Vorschaltdichtung angebracht werden. Diese ist eine wirksame Absperrung gegen Staub/Schmutz. Eine solche Vorschaltdichtung ist einfach und kostengünstig herstellbar und weist kleine Abmessungen auf.The sealing area can, starting from the mounting flange, be arched axially in the direction of the environment. Especially for such a design, the sealing ring with the sealing collar according to the invention is of particular advantage.
Sealing sleeves, which bulge in the direction of the environment, have the advantage that the radial contact pressure of the sealing collar on the shaft at the free end of the sealing sleeve can be controlled. This results in an increased sealing effect and a longer service life. At the free end of the sealing sleeve, a Vorschaltdichtung can be attached. This is an effective barrier against dust / dirt. Such Vorschaltdichtung is simple and inexpensive to produce and has small dimensions.

Bei der Montage in den Ringspalt zwischen der Welle und der aufnehmenden Bohrung wird die Dichtmanschette, montagebedingt, in ihre bestimmungsgemäße Gestalt verformt. Einem Montagekonus zur Montage der Dichtmanschette bedarf es nicht. Montagefehler sind bei einer solchen Ausgestaltung auf ein Minimum reduziert.When mounting in the annular gap between the shaft and the receiving bore, the sealing sleeve, due to the assembly, is deformed into its intended shape. A mounting cone for mounting the sealing sleeve is not required. Assembly errors are reduced to a minimum in such an embodiment.

Die radiale Vorspannung, mit der der Dichtbereich die Oberfläche des abzudichtenden Maschinenelements dichtend umschließt, ist, im Längsschnitt betrachtet, derart unterschiedlich, dass der Dichtbereich auf seiner dem Befestigungsbereich zugewandten Seite eine höhere Anpressung aufweist als im Bereich seines freien Endes. Dies gilt insbesondere dann, wenn die Gestalt der Rückfördereinrichtung entlang des gesamten Dichtbereichs übereinstimmend wäre.The radial prestress with which the sealing area sealingly surrounds the surface of the machine element to be sealed is, viewed in longitudinal section, so different that the sealing area has a higher contact pressure on its side facing the fastening area in the area of his free end. This is especially true if the shape of the return conveyor along the entire sealing area would be consistent.

Um die radiale Anpressung speziell des freien Endes des Dichtbereichs an die Oberfläche des abzudichtenden Maschinenelements zu erhöhen und dadurch eine radiale Vorspannung zu erreichen, wie auf der dem Befestigungsbereich axial zugewandten Seite, ist es erforderlich, eine Materialschwächung in diesem Bereich, beispielsweise durch die Rückfördereinrichtung, zu minimieren. Dies kann beispielsweise dadurch erreicht werden, dass die Nuttiefe von der dem Befestigungsbereich zugewandten Seite entlang des Dichtbereichs in Richtung des freien Endes des Dichtbereichs, bei ansonsten gleichen Abmessungen, reduziert wird. Durch eine solche Ausgestaltung ist nicht nur die spezifische Förderleistung entlang des Dichtbereichs gleich sondern auch die radiale Vorspannung, mit der der Dichtbereich die Oberfläche des abzudichtenden Maschinenelements umschließt.In order to increase the radial contact pressure, in particular of the free end of the sealing area, to the surface of the machine element to be sealed and thereby achieve a radial prestressing, as on the side facing axially the fastening area, it is necessary to weaken the material in this area, for example by the return conveyor device. to minimize. This can be achieved, for example, by reducing the groove depth from the side facing the fastening region along the sealing region in the direction of the free end of the sealing region, with otherwise identical dimensions. Such a design not only equals the specific delivery rate along the sealing area but also the radial prestress with which the sealing area encloses the surface of the machine element to be sealed.

Die Dichtmanschette kann beispielsweise aus einem PTFE-Compound bestehen. PTFE ist ein Werkstoff, der gegen die meisten abzudichtenden Medien beständig ist und während der gesamten Gebrauchsdauer des Dichtrings nur einen vernachlässigbar geringen, abrasiven Verschleiß aufweist.The sealing collar can for example consist of a PTFE compound. PTFE is a material which is resistant to most media to be sealed and has negligible abrasive wear throughout the life of the seal.

Kurzbeschreibung der ZeichnungBrief description of the drawing

Zwei Ausführungsbeispiele des erfindungsgemäßen Dichtrings werden nachfolgend anhand der Figuren 1 bis 6 näher erläutert. Diese zeigen jeweils in schematischer Darstellung:

Figur 1
ein erstes Ausführungsbeispiel in längsgeschnittener Darstellung, wobei die Dichtmanschette in Richtung der Umgebung vorgewölbt ist.
Figur 2
den Dichtbereich der Dichtmanschette aus Figur 1,
Figur 3
ein zweites Ausführungsbeispiel mit einer von Figur 1 abweichend gestalteten Dichtmanschette, wobei die Dichtmanschette in Richtung der Umgebung vorgewölbt ist.
Figur 4
den Dichtbereich der Dichtmanschette aus Figur 3.
Figur 5
ein drittes Ausführungsbeispiel, wobei die Steigung und/oder die Breite der Rückfördernut entlang des Dichtbereichs variiert ist. Die Dichtmanschette ist in Richtung der Umgebung vorgewölbt.
Figur 6
einen Gehäuseverschlussdeckel, in den der erfindungsgemäße Dichtring integriert ist.
Two embodiments of the sealing ring according to the invention are described below with reference to the FIGS. 1 to 6 explained in more detail. These show in a schematic representation:
FIG. 1
a first embodiment in longitudinal section, wherein the sealing sleeve is bulged in the direction of the environment.
FIG. 2
the sealing area of the sealing sleeve off FIG. 1 .
FIG. 3
a second embodiment with one of FIG. 1 deviating designed sealing sleeve, wherein the sealing sleeve is bulged in the direction of the environment.
FIG. 4
the sealing area of the sealing sleeve off FIG. 3 ,
FIG. 5
a third embodiment, wherein the slope and / or the width of the Rückfördernut is varied along the sealing area. The sealing collar is bulging in the direction of the environment.
FIG. 6
a housing closure cover, in which the sealing ring according to the invention is integrated.

Ausführung der ErfindungEmbodiment of the invention

In den Figuren 1 und 3 ist jeweils ein Dichtring während seiner bestimmungsgemäßen Verwendung gezeigt.In the FIGS. 1 and 3 in each case a sealing ring is shown during its intended use.

Das abzudichtende Maschinenelement 5 wird in den hier gezeigten Ausführungsbeispielen jeweils durch eine Welle gebildet.The machine element 5 to be sealed is in each case formed by a shaft in the exemplary embodiments shown here.

Die in den Figuren 1 und 3 gezeigten Dichtringe umfassen jeweils eine Dichtmanschette 1 aus polymerem Werkstoff, in den hier gezeigten Ausführungsbeispielen aus einem PTFE-Compound. Im Längsschnitt betrachtet, sind die Dichtmanschetten 1 jeweils L-förmig ausgebildet und umfassen einen sich im wesentlichen in radialer Richtung erstreckenden Befestigungsbereich 2 und einen sich im wesentlichen in axialer Richtung erstreckenden Dichtbereich 3. Der Befestigungsbereich 2 und der Dichtbereich 3 sind in den hier gezeigten Ausführungsbeispielen einstückig ineinander übergehend und materialeinheitlich ausgebildet.The in the FIGS. 1 and 3 sealing rings shown each comprise a sealing sleeve 1 of polymeric material, in the embodiments shown here of a PTFE compound. Viewed in longitudinal section, the sealing collars 1 are each L-shaped and comprise a fastening area 2 extending essentially in the radial direction and a sealing area 3 extending essentially in the axial direction. The fastening area 2 and the sealing area 3 are in the exemplary embodiments shown here integrally merging into each other and formed of the same material.

Der Dichtbereich 3 der Dichtmanschette 1 umschließt die Oberfläche 4 des abzudichtenden Maschinenelements 5 mit radialer Vorspannung dichtend. Auf der der Oberfläche 4 radial zugewandten Seite des Dichtbereichs 3 ist eine als Rückfördereinrichtung 6 ausgebildete, spiralförmige Rückfördernut 12 angeordnet, zur Förderung von abzudichtendem Medium 7 in Richtung des abzudichtenden Raums 8.The sealing region 3 of the sealing collar 1 surrounds the surface 4 of the machine element 5 to be sealed with a radial prestress in a sealing manner. On the surface 4 radially facing side of the sealing region 3 is designed as a return conveyor 6, spiral return feed groove 12 is arranged to promote sealed medium 7 in the direction of the space to be sealed. 8

In beiden hier gezeigten Ausführungsbeispielen ist die Dichtmanschette 1 axial in Richtung der Umgebung 11 vorgewölbt. Entscheidend ist, dass die als Rückfördereinrichtung 6 ausgebildete Profilierung 9 ein Fördervolumen 10/eine Förderleistung aufweist, das/die vom abzudichtenden Raum 8 in Richtung Umgebung 11 reduziert ist. Die spezifische Förderleistung entlang des gesamten Dichtbereichs ist dadurch gleich; die Förderleistung der Rückfördereinrichtung 6 ist auf die in den abzudichtenden Raum 8 zurück zu fördernde Menge abzudichtenden Mediums 7 abgestimmt.In both embodiments shown here, the sealing collar 1 is bulged axially in the direction of the environment 11. The decisive factor is that the profile 9 designed as a return conveyor 6 has a delivery volume 10 / a delivery rate which is reduced from the space 8 to be sealed in the direction of the environment 11. The specific delivery rate along the entire sealing area is the same; the delivery rate of the return conveyor 6 is matched to the medium to be sealed back into the space 8 to be sealed medium 7.

In den hier gezeigten Ausführungsbeispielen sind sowohl die Steigung 14 als auch die Breite 15 der Rückfördernut 12 entlang des Dichtbereichs 3 im wesentlichen konstant. Die einzige Variable zur Erreichung einer konstanten spezifischen Förderleistung ist die Nuttiefe 13. Die Nuttiefe 13 ist entlang des Dichtbereichs 3 derart variiert, dass die Rückfördernut 12 eine sich vom abzudichtenden Raum 8 entlang des Dichtbereichs 3 in Richtung der Umgebung 11 verringernde Nuttiefe 13 aufweist. Das Verhältnis aus der größten Nuttiefe 13.1 auf der dem abzudichtenden Raum 8 zugewandten Seite zur kleinsten Nuttiefe 13.n im Dichtbereich beträgt in den hier gezeigten Ausführungsbeispielen 4.In the embodiments shown here, both the pitch 14 and the width 15 of the return feed groove 12 along the sealing area 3 are substantially constant. The only variable for achieving a constant specific delivery rate is the groove depth 13. The groove depth 13 is along the groove depth 13 Sealing region 3 is varied such that the return feed groove 12 has a from the sealed space 8 along the sealing region 3 in the direction of the environment 11 decreasing groove depth 13. The ratio of the largest groove depth 13.1 on the side to the sealed space 8 side to the smallest groove depth 13.n in the sealing area is in the embodiments shown here 4th

In Figur 1 ist ein erstes Ausführungsbeispiel des erfindungsgemäßen Dichtrings gezeigt. Die Dichtmanschette 1 weist nur auf der abzudichtenden Oberfläche 4 des Maschinenelements 5 eine Profilierung 9 in Form einer Rückfördernut 12 auf. Auf der der Oberfläche 4 abgewandten Seite der Dichtmanschette 1 ist diese eben ausgebildet.In FIG. 1 a first embodiment of the sealing ring according to the invention is shown. The sealing collar 1 has only on the surface 4 to be sealed of the machine element 5 a profiling 9 in the form of a return feed groove 12. On the side facing away from the surface 4 of the sealing sleeve 1, this is flat.

Die Rückfördernut 12 ist, im Längsschnitt betrachtet, im wesentlichen trapezförmig ausgebildet.The return feed groove 12 is, viewed in longitudinal section, formed substantially trapezoidal.

In Figur 2 ist der Dichtbereich 3 der Dichtmanschette 1 vergrößert dargestellt.In FIG. 2 the sealing region 3 of the sealing sleeve 1 is shown enlarged.

In Figur 3 ist ein zweites Ausführungsbeispiel des erfindungsgemäßen Dichtrings gezeigt, der sich vom Dichtring aus Figur 1 durch eine abweichend gestaltete Dichtmanschette 1 unterscheidet.In FIG. 3 a second embodiment of the sealing ring according to the invention is shown, which extends from the sealing ring FIG. 1 differs by a differently shaped sealing collar 1.

Abweichend von der Dichtmanschette 1 aus Figur 1 ist die Dichtmanschette 1 aus Figur 3 zusätzlich auf der der Oberfläche 4 radial abgewandten Seite des Dichtbereichs 3 mit einer zweiten Profilierung 16 versehen. Die zweite Profilierung 16 ist in der Regel weniger tief und mit kleinerer Teilung als die erste Profilierung 9 ausgeführt.Deviating from the sealing sleeve 1 off FIG. 1 is the sealing sleeve 1 off FIG. 3 additionally provided on the surface 4 radially facing away from the sealing portion 3 with a second profiling 16. The second profiling 16 is usually carried out less deep and with a smaller pitch than the first profiling 9.

Außerdem weist das freie Ende 17 der Dichtmanschette 1 eine in Richtung der Umgebung 11 angeordnete Vorschaltdichtung 18 auf, die Verunreinigungen aus der Umgebung 11 vom Dichtbereich 3 fern hält. Die Vorschaltdichtung 18 ist einstückig ineinander übergehend und materialeinheitlich mit der Dichtmanschette ausgeführt.In addition, the free end 17 of the sealing sleeve 1 has a arranged in the direction of the environment 11 Vorschaltdichtung 18, the impurities from the environment 11 from the sealing area 3 keeps away. The Vorschaltdichtung 18 is integrally merging with each other and made of the same material with the sealing sleeve.

In Figur 5 ist ein drittes Ausführungsbeispiel gezeigt, bei dem die Breite und/oder die Steigung 19/20 der Rückfördernut 12 entlang des Dichtbereichs 3 variiert ist.In FIG. 5 a third embodiment is shown, in which the width and / or the slope 19/20 of the return feed groove 12 along the sealing region 3 is varied.

In Figur 6 ist ein Gehäuseverschlussdeckel 21 gezeigt, in den der erfindungsgemäße Dichtring integriert ist. Die statisch wirkende Dichtung am Gehäuseverschlussdeckel 21 ist mit der Bezugsziffer 22, der Messwertgeber/das Multipolrad mit der Bezugsziffer 23 und der Messwertaufnehmer/Sensor mit der Bezugsziffer 24 versehen.In FIG. 6 a housing closure cover 21 is shown, in which the sealing ring according to the invention is integrated. The statically acting seal on the housing closure cover 21 is provided with the reference numeral 22, the transmitter / multipole wheel with the reference numeral 23 and the transducer / sensor with the reference numeral 24.

Die hier dargestellten Ausführungsbeispiele stellen keine Begrenzung des Schutzumfangs dar, insbesondere kann die Rückfördereinrichtung 6 spiralförmig, schraubengangförmig oder konzentrisch gestaltet sein, eingängig oder mehrgängig, und die Rückfördernuten können, im Längsschnitt betrachtet, beispielsweise trapezförmig, dreieckförmig, sägezahnförmig oder raupenförmig sein. Die Rückfördernut 12 kann abgesperrt sein, zum Beispiel durch ein Schott und/oder durch einen umlaufenden Vorsprung. Abweichend von einem PTFE-Compound, aus dem die Manschette 1 besteht, können auch andere geeignete Werkstoffe für die Dichtmanschette 1 zur Anwendung gelangen.The exemplary embodiments illustrated here do not represent a limitation of the scope of protection. In particular, the return conveyor 6 can be helical, helical or concentric, catchy or more continuous, and the return grooves can, for example, be trapezoidal, triangular, sawtooth or caterpillar in longitudinal section. The return feed groove 12 can be shut off, for example by a bulkhead and / or by a circumferential projection. Notwithstanding a PTFE compound from which the sleeve 1 is made, other suitable materials for the sealing sleeve 1 can be used.

Claims (9)

  1. Sealing ring, comprising a sealing collar (1) which is made from polymeric material and, during correct use, is of substantially L-shaped design, as viewed in longitudinal section, with a fastening region (2) which extends substantially in the radial direction, and with a sealing region (3) which extends substantially in the axial direction and, with radial prestress, sealingly surrounds the surface (4) of a machine element (5) which is to be sealed, wherein the sealing region (3), on the side facing the surface (4), has at least one return device (6) for conveying medium (7) which is to be sealed in the direction of the space (8) which is to be sealed, wherein the return device (6) is formed by a profiling (9), with a volumetric delivery (10) which is reduced from the space (8) which is to be sealed in the direction of the surroundings (11), wherein the return device (6) is formed by at least one spiral return groove (12), and wherein the return groove (12) has a groove depth (13) which is reduced in size from the space (8) which is to be sealed along the sealing region (3) in the direction of the surroundings (11), characterized in that the ratio of greatest groove depth (13.1) to smallest groove depth (13.n) in the sealing region (3) is 2 to 6.
  2. Sealing ring according to Claim 1, characterized in that the volumetric delivery (10) is reduced continuously along the sealing region (3) from the space (8) which is to be sealed in the direction of the surroundings (11).
  3. Sealing ring according to either of Claims 1 and 2, characterized in that the volumetric delivery (10), as viewed along the sealing region (3), is proportional to the quantity of medium (7) which is to be sealed and which is to be conveyed back into the space (8) which is to be sealed.
  4. Sealing ring according to one of Claims 1 to 3, characterized in that the pitch (14) of the return groove (12) along the sealing region (3) is substantially constant.
  5. Sealing ring according to one of Claims 1 to 4, characterized in that the width (15) of the return groove (12) along the sealing region (3) is substantially constant.
  6. Sealing ring according to one of Claims 1 to 5, characterized in that the width and/or the pitch (19, 20) of the return groove (12) along the sealing region (3) is varied.
  7. Sealing ring according to one of Claims 1 to 6, characterized in that the sealing region (3) is precurved axially from the fastening region (2) in the direction of the surroundings (11).
  8. Sealing ring according to one of Claims 1 to 7, characterized in that the sealing collar (1) is composed of a PTFE compound.
  9. Housing closure cover, comprising a sealing ring according to one of Claims 1 to 8 which is integrated in the housing closure cover.
EP04004953A 2003-03-07 2004-03-03 Seal ring Expired - Lifetime EP1455122B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10309907A DE10309907B4 (en) 2003-03-07 2003-03-07 seal
DE10309907 2003-03-07

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EP1455122A1 EP1455122A1 (en) 2004-09-08
EP1455122B1 true EP1455122B1 (en) 2009-10-07

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EP04004953A Expired - Lifetime EP1455122B1 (en) 2003-03-07 2004-03-03 Seal ring

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US (1) US20040173973A1 (en)
EP (1) EP1455122B1 (en)
JP (2) JP2004270942A (en)
AT (1) ATE445114T1 (en)
CA (1) CA2457185A1 (en)
DE (2) DE10309907B4 (en)
MX (1) MXPA04002029A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006266343A (en) * 2005-03-23 2006-10-05 Nok Corp Sealing device
DE102005024006B4 (en) * 2005-05-25 2015-09-03 Ab Skf compressor seal
US8925927B2 (en) 2006-02-10 2015-01-06 Freudenberg-Nok General Partnership Seal with controllable pump rate
US8376369B2 (en) 2006-02-10 2013-02-19 Freudenberg-Nok General Partnership Seal with spiral grooves and contamination entrapment dams
US8505926B2 (en) * 2010-03-11 2013-08-13 Federal-Mogul Corporation Low torque shaft seal with improved seal element bond joint
US8919782B2 (en) 2012-10-19 2014-12-30 Freudenberg-Nok General Partnership Dynamic lay down lip seal with bidirectional pumping feature
US10711899B2 (en) 2015-11-30 2020-07-14 Nok Corporation Seal device

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Publication number Priority date Publication date Assignee Title
AU1268870A (en) * 1969-03-22 1971-09-23 Super Oil Seals And Gaskets Limited Improvements in or relating to seals
GB2167817B (en) * 1984-12-03 1988-04-20 Aeroquip Rotary seal with variable pitch hydrothread
DE3545683C1 (en) * 1985-12-21 1987-07-16 Freudenberg Carl Fa Shaft seal
EP0615085B2 (en) * 1993-03-12 2000-01-26 Dichtungstechnik G. Bruss GmbH & Co. KG Method for making a shaft seal
EP1024318A3 (en) * 1999-01-29 2001-04-25 Freudenberg-NOK General Partnership Reverse seal
DE19922842A1 (en) * 1999-05-19 2000-11-23 Kaco Gmbh Co Radial shaft seal comprises sealing ring with backflow device which has spiral groove extending between air side and medium side of device
DE10024026A1 (en) * 2000-05-16 2001-11-29 Freudenberg Carl Fa Sealing sleeve, especially for installation spaces with small dimensions
DE10033446C5 (en) * 2000-07-10 2006-12-14 Dichtungstechnik G. Bruss Gmbh & Co. Kg Shaft seal
US20030098545A1 (en) * 2001-11-27 2003-05-29 Webb Daniel S. Gaming apparatus and method for play thereof
US6705617B2 (en) * 2001-11-28 2004-03-16 Federal-Mogul World Wide, Inc. Hydrodynamic seal and method of making the same

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JP3144908U (en) 2008-09-18
CA2457185A1 (en) 2004-09-07
DE10309907B4 (en) 2007-02-01
US20040173973A1 (en) 2004-09-09
EP1455122A1 (en) 2004-09-08
DE10309907A1 (en) 2004-09-16
ATE445114T1 (en) 2009-10-15
DE502004010185D1 (en) 2009-11-19
JP2004270942A (en) 2004-09-30
MXPA04002029A (en) 2004-09-09

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